(Solution) - Consider the sequence x n given by x n n u n -(2025 Original AI-Free Solution)

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Consider the sequence x[n] given by x[n] = ?n u[n]. A periodic sequence x[n] is constructed from x[n] in the following way:
(a) Determine the Fourier transform X(ej?) of x[n].
(b) Determine the discrete Fourier series X[k] of x[n].
(c) How is X[k] related to X(ej?)?